Device for pressing top roller of textile machine



Sept. 19, 1967 shbHAcHlRo YANd 3,341,902

DEVICE FOR PRESSING TOP ROLLER OF TEXTILE MACHINE Filed June 29, 1 964 5 Sheets-Sheet 1 Syn/M or? a VA 0 I INVENTOR.

Mil/n7 Filed June 29, 1964 l 1967 SHOHACHIRO YANO 3,341,902

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INVENTOR.

BY M 264% Sept 19, 1967 v SHOHACHIRO YANO 3,341,902

DEVICE FOR PRESSING TOP ROLLER OF TEXTILE MACHINE Filed June 29, 1964 3 Sheets-Sheet 3 a a mi 2 f 10 1 I j a a w 7 7;

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United States Fatent O 3,341,902 DEVICE FOR PRESSING TOP ROLLER F TEXTILE MACHINE Shohachiro Yano, Nara-shi, Japan, assignor to G-M Ltd, Osaka, Japan Filed June 29, 1964, Ser. No. 378,809 4 Claims. (Cl. 19-281) The present invention relates to top roller assemblies for spinning frames and aims generally to improve the same. A particular aim of the invention is to eliminate pressure irregularity of a plurality of juxtaposed loading arms in operative condition. To this end means is provided to lock said loading arms in uniform condition and apply uniform pressures as a whole, and means is provided for effectively utilizing the resiliency stored in spring means housed in each loading arm as well as utilizing the space within the loading arms.

In most of the conventional top roller pressing devices, there is housed in the rear end portion of said loading arm a loading arm locking mechanism by means of which said loading arm is secured to an annular metal attachment mounted on a horizontal shaft. In such conventional arrangement, however, a high torque as the reaction of the pressing force necessarily acts on the locking portion of said loading arm, so that it is diflicult to reliably secure the loading arm in its predetermined position. That is, during the use thereof the reaction of the pressing force causes troubles such as the loosening or wear of the annular metal attachment and the variation in pressure force. Also an alternative arrangement is known wherein a long hook depends from the end of a loading arm, said hook being adapted to engage a loading device on the machine frame. Such hook means involves inconvenience in that the engaging of the hook must be effected under bottom rollers and that when the loading arm is raised the hook depending therefrom interferes with operation. The foregoing are drawbacks which accompany the carrier mechanism for loading arms, while the conventional top roller pressing spring means involves the following drawbacks.

In the conventional spring means for pressing top rollers, there are housed in a loading arm springs which are as many as or more than top rollers, the upper ends of said springs abutting against the inner surface of the top plate of the loading arm, the lower ends thereof abutting against the upper surfaces of top rollers thereby pressing said top rollers against bottom rollers. Thus, only one side of each spring is utilized. Further, such springs are spaced apart longitudinally between the inner surface of the top plate and top rollers, with the result that the thickness of the loading arm must be increased more than is necessary. As a result, these loading arms become bulky and hence their weight is increased. Further, as many springs as or more springs than top rollers are required.

Accordingly, the present invention intends to remove the above-mentioned drawbacks. According to the invention, a bar extending horizontally along bottom rollers is spanned between roller stands, and hook means pivotally mounted on both side Walls of a loading arm engages said bar, so that the reaction of pressing force is reliably supported by the bar. The middle part of said bar is connected to a machine base by a rod, so that it is possible to hold the bar horizontally and perfectly nullify the deflection of the bar by means of the machine base through the rod. It is, therefore, possible to lock each loading arm in its predetermined position, arrange the same in a fixed condition and apply a uniform pressure to one staff throughout. Also, according to the invention even a relatively thin bar can fully endure the reaction of pressure, so that the structure of rollers parts can be simplified by the utilization of bottom tensor bars.

3,341,992 Patented Sept. 19, 1967 Further, according to the invention, support plates are pivotally mounted on a pin transversing opposed side walls of a loading arm and a loading spring is compressed between the support plates to expand the latter by the opposed ends of said spring, each of said support plates being engaged with a top roller, so that such single spring can press more than two sets of top rollers. As a result, the structure of said loading arm can be very much simplified and the opposed ends of a spring can be effectively utilized. Further, since such spring may be laterally provided in the space of a loading arm, the thickness of the loading arm can be considerably thinned, a fact which serves for obtaining a small, light weight loading arm.

The invention will now be described in more detail in connection with preferred embodiments of the invention shown in the accompanying drawings, in which:

FIG. 1 is a front view of top roller pressing devices each mounted on their respective top rollers;

FIG. 2 is a side view of one of the assemblies shown in FIG. 1;

FIG. 3 is a sectional view taken on line AA of FIG. 1, showing the condition in which two coiled springs press four sets of top rollers; and

FIG. 4 and 5 are modifications of the arrangement shown in FIG. 3, FIG. 4 showing the condition in which a single coiled spring presses three sets of top rollers, FIG. 5 showing the condition in which a single plate spring presses three sets of top rollers the dot-dash lines in FIGS. 2-5 indicating the locations of cooperating parts of the machine which may be of conventional form and the details of which form no part of the present invention.

Referring to FIGS. 1 and 2, 1 indicates roller stands; 2 indicates a horizontal shaft spanned between the roller stands; 3 indicates loading arms of inverted U-shaped cross-section having one of their respective ends pivotally mounted on said horizontal shaft. The loading arm supports the shaft 5 of the two-spindle type top roller 4, and is temporarily secured to a machine base during drafting operation. The loading arm is provided with top roller pressing spring means, hereinafter described, whereby said top rollers 4 are pressed against bottom rollers 7 held in predetermined position and positively rotated. 8 indicates a bar horizontally extending along the bottom rollers, said bar 8 being spanned between the roller stands 1. The bar is so positioned as to intersect at right angles with the extreme end of the loading arm 3. Such bar 8 may be specially provided or, instead, a known tensor bar may be utilized to serve as such bar. In the illustrated examples, a tensor bar is utilized as such bar. Numeral 9 indicates an adjustable tie rod means for effecting connection between the middle point 8' of the bar 8 and the machine base 10, and in the illustration here it has a turnbuckle 11 which is rotated to adjust the length of the tie rod means. By means of this tie rod means 9, the bar is pulled downward. Numeral 12 indicates a hook having its upper end pivotally mounted on the opposed side walls of the loading arm 3. The lower end 12' thereof is engaged with a notch formed in the rear surface of the bars 8 or the inverted U-shaped metal attachment 13 secured to the upper surface of the bar 8, so that the hook causes the loading arm 3 to be locked in predetermined position against the resiliency of the top roller loading spring means hereinafter described. In addition, the hook 12 may be provided within the loading arm 3.

In the above-mentioned structure, the adjustment of the bar 8 is made in such a manner that the turnbuckle 11 is turned to adjust the length of the rod 9 to nullify the deflection of the bar 8 so that the deflection thereof at the middle point 8' may be zero. Usually, three loading arms are provided for one section of a spinning frame. Therefore, if the middle point 8 of the bar 8 is connected to the machine base so that the deflection at the middle point 8' may be zero, the span of the bar 8 will be half of one section, and, further, since the point of application of the loading arms 3 on both sides is biased toward the roller stand side, the deflection of the bar 8 can be considerably decreased. For example, when a bar, which would produce a deflection of 2 mm. in the absence of such rod, is provided with a rod and is pulled at the middle point thereof, the maximum deflection thereof is 0.06 mm., so that the bar may be regarded as practically producing no deflection. Thus, the three loading arms 3 are horizontally locked and the pressing forces on the top rollers all function equally.

The foregoing is the description which is concerned with the support mechanism of the loading arms.

Next, a pressing mechanism for top rollers will be described.

Referring now to FIGS. 1, 2 and 3, 14 indicates bearings, by which the top roller shaft 5 is embraced, and 15, 16, 17 and 18 indicate plates for supporting the bearings. These plates may be formed integrally each with their respective bearings 14 or may be separately formed and bolted thereto. The support plate 15 is bell-crank shaped. Its fulcrum portion 15' together with a second support plate 16 is mounted on a pin 19 transversing the side walls of the loading arm 3. Vertically positioned between the oppositely facing abutment faces provided by the top end 15" of the support plate 15 and the second support plate 16 is a loading spring 6. The support plates 17 and 18 for other sets of rollers are each L-shaped having their inner ends 17' and 18 overlapped on each other and pivotally mounted on a pin 20 in the loading arm 3. A loading coiled spring 21 is horizontally installed between the oppositely facing abutment faces provided by the other ends 17" and 18 of said support plates 17 and 18. Numerals 22 and 23 indicate stop members provided under pins 19 and 20 between the opposed side walls of the loading arm. The stop members are in the form of plates for preventing the drooping of the support plates 15, 16, 17 and 18 when the loading arm 3 is raised. The foregoing embodiment shown in FIG. 3 is so arranged that the loading coiled springs 6 and 21 press their respective two sets of top rollers, and when the loading arm is mounted in operative position, the coiled springs 6 and 21 are slightly com pressed and the resulting reactions thereof so function as to spread apart the oppositely facing abutment faces provided by the support plates 15, 16 and 17, 18 at the op posed ends of the springs 6 and 21, thereby pressing the top rollers on their respective bottom rollers.

An embodiment shown in FIG. 4 is so arranged that a single loading coiled spring 29 presses three sets of top rollers. An L-shaped support plate 26 is pivotally mounted on a pin at the front end of the loading arm 3. A bearing 14 is attached to the support plate 26. Numeral 27 indicates an L-shaped plate having a lower piece 27' made horizointally long, said lower piece 27 being pivotally connected to the loading arm by means of a pin 28. A loading spring 29 is horizontally provided between the upper ends 26' and 27 of the two support plates 26 and 27. Numeral 30 indicates a support plate provided with bearings 14 each secured to the respective opposed ends thereof, and having an elongated opening 31 formed in the front end portion thereof. Said elongated opening 31 loosely receives a pin 28. A pressure receiving piece 32 is formed on the upper middle portion of said support plate 30, and abuts against the lower piece 27' of the L-shaped support plate 27 Numeral 33 indicates a stop member for preventing the drooping of the support plate 30 when the loading arm 3 is raised. Said stop member is provided under the support plate 30 and spanned between the opposed side walls of the support plate 30 so as to intersect at right angles with the latter. In the above-mentioned structure, when said support arm is mounted in operative position, the loading coiled spring 29 so functions as to load the plates 26 and 27 at its opposed ends. As a result, the support plates 26 directly presses a set of rollers, and

4 the resiliency acting on the other support plate 27 is dis tributed at the pressure receiving piece 32 to two sets of top rollers through the support plate 30.

While the above-mentioned devices shown in FIGS. 3 and 4 are the case in which top rollers are pressed by coiled springs, another embodiment shown in FIG. 5 is such that three top rollers are pressed by a single plate spring. As shown in FIG. 5, a bell-crank-shaped support plate 34 is pivotally connected to the front end of the loading arm 3 by means of a pin 35, and is provided at the upper end thereof with a branched plate 36 which extends horizontally. Such branched plate 36 may be formed by bending the upper end of the support plate or may be separately formed and bolted or otherwise secured thereto. A support plate 37 having bearings 14 one at either end thereof is provided at its front and rear ends with elongated openings 38 into which pins 39 are loosely inserted to allow said support plate 37 to be somewhat moved up and down. A plate spring 40 is horizontally installed in the loading arm 3, and has its root portion 40' arrested by a latch member 41 and has its open or free ends 40" and 40" engaging the support plates 34 and 37. Thus, the free end 40" overlies the support plate 36 and is held in position by abutting the head of a bolt 42 forming an extension of the support plate 34. The other free end 40' is provided with a projection 43 abutting against the central portion of the upper surface of the support plate 37. Because of the described structure, when the loading arm 3 is mounted in operative position, the free ends 40" and 40" are slightly compressed so that the resulting reactions directly downwardly press the support plate 34 at the free end 40" and the support plate 37 at the free end 40" through the projection 43, thereby pressing two sets of top rollers on their respective bottom rollers to provide draft loads for slivers.

With the arrangements described above, it is possible to apply pressures to two, three or more sets of top rollers by means of only a single loading spring means and adjust and distribute pressures at will by suitably changing the position of bearing metals with respect to their respective support plates.

While the preferred forms of the invention have been shown and described herein, it is to be understood that the same is not so limited but shall cover and include any and all modifications of the invention which fall within the purview thereof.

What I claim is:

1. A textile machine of the type comprising (a) a base,

(b) spaced roller stands carried thereby,

(0) bottom rollers supported by said stands and spanning horizontally therebetween, (d) a plurality of sets of top rollers spaced longitudinally of and bearing against said bottom rollers, and

(e) a plurality of loading means correspondingly spaced longitudinally of said bottom rollers and comprising spring pressed bearing means for pressing the said sets of top rollers against said bottom rollers,

said machine comprising, in combination:

(f) a bar supported by said stands and horizontally extending parallel to said bottom rollers and spanning the space between said stands,

(g) interengageable hook means carried by said bar and by the respective ones of said plurality of loading means and engageable for securing said loading means to said bar against the reactions of said spring pressed bearing means, and

(h) a tie rod means connecting the central part of the said bar to the said base,

(i) said tie rod means being adjustable in length to nullify deflection of said bar due to the reaction of said spring pressed bearing means transmitted through said hook means.

2. A textile machine as claimed in claim 1, wherein said machine comprises, under each loading means, at

least two juxtaposed ones of said top rollers for bearing upon a plurality of said separate bottom rollers, separate bearing supporting plates for said juxtaposed top rollers each pivoted to said loading means between said juxtaposed top rollers, said bearing supporting plates having oppositely facing abutment faces adapted to spread apart as said top rollers move from said loading means toward said bottom rollers, and spring means interposed between said oppositely facing abutment faces for urging them apart.

3. A textile machine as claimed in claim 2,, wherein said oppositely facing abutment faces are directly opposed to each other, and said spring means is in the form of a coiled compression spring interposed between said abutment faces.

4. A textile machine as claimed in claim 2, wherein said spring means extends longitudinally of said loading means.

References Cited UNITED STATES PATENTS MERVIN STEIN, Primary Examiner. D. NEWTON, Assistant Examiner. 

